spluttering below 2k revs

spluttering below 2k revs

folks have an 82 katana 1100 starting and running good but up to 2k revs she has a bit of a splutter then when reach 3 to 4 k she perfect,rather than pulling off the carbs is there anything i can put in the tank to try clean the jets out ?

Source: spluttering below 2k revs